So I'm breaking in my newly rebuilt engine and didn't drop for break in oil as you can just get some straight 30 weight and add zinc to get pretty much the same thing for like 1/3. Run it for the first 3-5 hours (200-250 miles) and then change it.

Though sometimes tricky to find, Auto Zone has 1 gal Rotella SAE 30 for like 16 and I picked up a bottle of Zinc from O'Reilly's Auto the other day.

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When I ran into the local auto parts store (Mike's / he's a great guy), I wanted to grab another bottle of Zinc, I noticed the same bottle on the shelf...
Mike jokingly asked why I'd buy a bottle of nothing ~ and when I told him what I was doing, he said he could order some Zinc additive for me.

Puzzled, I said, "isn't that zinc?"

Mike: "didn't you read the label?"

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"Does not contain Zinc or Phosphorous"
................WHAT THE WHAT!

So my zinc additive will be in today.
** he said, though this does roughly the same thing for an older engine, it's not the best thing for a new engine because it'll reduce the vital wear-in of the rings and such.....